Device unavailable issue

[will]

Hi, I'm using vDOS to keep a legacy invoicing software ticking. 
The issue I'm having is the a key feature, logging charges, is causing a [Device unavailable in module FJOBCOST at address 1002:1F51quiry & modification] error when I try and use it.
I think this is due to lacking some physical component that is part of the physical machine, but am unsure.

Could I please get some advice on how to start solving this issue? I've tried dumping the entire original PC's HD into the virtual environment, but that hasn't solved the issue.

[Jos]

Hard to tell. Could it be the program:

Tries to access some serial device, and expects a specific response of that, or
Requires (is protected by) a dongle to operate.

The original physical machine is a PC and still functioning?

Eventually you can start vDos with the log option (....vDos.exe /log). But I doubt that "[Device unavailable...] will be trapped in the generated vDos.log will

Jos

[will]

Yeah, the original is still running fine, we are just in the middle of moving offices, so trying to get it onto a more portable format.
The PC has nothing but a mouse and keyboard plugged in, but I can open it up to check if there's anything inside it might be trying to ping.

Where does the log generate? I'll give that a go.

[Jos]

vDos.log is stored in the directory of vDos.exe.

Jos